More than 3,000 people are living in "overcrowded, unsafe and unhygienic" conditions, according to Human Rights Watch.

A spokeswoman for Doctors without Borders told IBTimes UK that conditions on Lesbos have deteriorated dramatically since the start of June. She said there was a four-fold increase in the number of people arriving in June, 785, compared with April, 230, and that the healthcare provision had been drastically reduced in recent months, despite the concerning number of refugees suffering from mental health trauma.

A Doctors without Borders assessment of 154 people found that:

79% were suffering from severe mental health problems

A fifth of these people had been tortured before arriving in Greece

Over a third of people had developed Post-Traumatic Stress Disorder

"There is a very high level of suffering," Dr Declan Barry, a medical coordinator with Doctors without Borders, told the Irish Times. "That this is happening in a European country is inexcusable, but it is very easy to ignore, because it's contained to the Greek islands."

He said that the EU-Turkey deal, which aims to stem the flow of refugees into Europe, has left hundreds of people feeling helpless and trapped inside Moria.

"The hope that was propelling people forward is gone. They had a goal, but now that they can't move on, the trauma they experienced at home is surfacing," Barry said.

"Refugees have been ignored and mistreated on the Greek islands for far too long, many waiting for months without having their initial asylum interviews," the CEO of Help Refugees, Josie Naughton told IBTimes UK.

"Without reforms to the current asylum procedures, accelerated transfers of refugees to the mainland, and changes to Europe's 'out of sight, out of mind' approach to the refugee crisis, this situation won't improve and people's lives will continue to be put at risk," she said.

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Tents were razed to the ground after a protest against living conditions in the Moria refugee camp escalated on 10 July 2017REUTERS/Elias Marcou

Tents were razed to the ground after a protest against living conditions in the Moria refugee camp escalated on 10 July 2017REUTERS/Elias MarcouMigrants walk among debris of burned shelters at the Moria refugee camp on the island of Lesbos, Greece on 10 July 2017REUTERS/Elias Marcou